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1 part peat moss
1 part perlite
1 part compost
1 part good garden soil
A handful each of:
Moisten the ingredients to make mixing easier. Place a ½-inch mesh screen over a garden cart or other large container, and sift all ingredients to remove any large particles. Mix thoroughly.
The handfuls of garden lime, soybean meal, rock phosphate, and kelp meal (any of which can be omitted) provide extra nutrients that enable this mix to feed plants for a year or two without additional fertilization.